SUPERSONIC FREE JET STUDIES OF VIBRATIONAL ENERGY TRANSFER IN $S_{1}$ p- DUFLUOROBENZENE
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Date
1992
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Ohio State University
Abstract
State-to-state vibrational energy transfer in $S_{1}$ p-difluorobenzene has been studied in a supersonic free jet. The vibrational energy flow patterns from the $8^{2}$ vibrational level were obtained for expansions of He and Ar. These patterns reveal that (i) the vibrational energy transfer process is selective, and (ii) the competition among vibrational channels is dependent on the collisional partner. We are able to account for these general features using a treatment of the Schwartz, Slawsky and Herzfeld-Tanczos model of vibrational energy transfer. This treatment is the same as that used to describe the vibrational energy flow patterns in $S_{1}$ p-difluorobenzene collisions with He and Ar at room temperature. This appears to suggest that vibrational energy transfer in $S_{1}$ p-difluorobenzene is governed by the same mechanism at both low and room temperatures.
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Author Institution: Department of Chemistry, Indiana University